As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO RECEIVE ON SATCOM 1 OR 2 ABLE TO TRANSMIT NORMALLY ON BOTH 1 AND 2 BUT CANNOT HEAR OUR TRANSMISSION OUT AND CANNOT HEAR INBD TRANSMISSION. ACFT GROUNDED. ACCOMPLISHED SATCOM VOICE TEST FOR BOTH NR 1 & NR 2 SIDES. VOICE TEST PASSES, REF AMM 23-15-00-730-801.